Version 4
SHEET 1 1128 680
WIRE 0 -112 -144 -112
WIRE 224 -112 0 -112
WIRE 352 -112 224 -112
WIRE 496 -112 352 -112
WIRE -144 -64 -144 -112
WIRE 224 -64 224 -112
WIRE -48 -32 -80 -32
WIRE 64 -32 32 -32
WIRE 432 0 288 0
WIRE -528 16 -608 16
WIRE -368 16 -448 16
WIRE 352 32 352 -112
WIRE 0 48 0 -112
WIRE 288 48 288 0
WIRE 320 48 288 48
WIRE -608 64 -608 16
WIRE -368 64 -368 16
WIRE -336 64 -368 64
WIRE -80 64 -80 -32
WIRE -80 64 -256 64
WIRE -32 64 -80 64
WIRE 432 64 432 0
WIRE 432 64 384 64
WIRE 448 64 432 64
WIRE 576 64 512 64
WIRE 64 80 64 -32
WIRE 64 80 32 80
WIRE 96 80 64 80
WIRE 224 80 224 16
WIRE 224 80 160 80
WIRE 320 80 224 80
WIRE -336 96 -368 96
WIRE -144 96 -144 16
WIRE -144 96 -256 96
WIRE -32 96 -144 96
WIRE -144 144 -144 96
WIRE 224 144 224 80
WIRE 576 144 576 64
WIRE -608 208 -608 144
WIRE -368 208 -368 96
WIRE -368 208 -608 208
WIRE -144 272 -144 224
WIRE 0 272 0 112
WIRE 224 272 224 224
WIRE 352 272 352 96
WIRE 576 272 576 224
FLAG 352 272 0
FLAG 0 272 0
FLAG -144 272 0
FLAG 224 272 0
FLAG 496 -32 0
FLAG 576 272 0
SYMBOL voltage 496 -128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 6.5
SYMBOL cap 448 80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C4
SYMATTR Value 2.2µ
SYMBOL cap 96 96 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C5
SYMATTR Value 2.2µ
SYMBOL res -240 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 -20 15 VTop 2
SYMATTR InstName R1
SYMATTR Value 2.2k
SYMBOL res -240 80 R90
WINDOW 0 67 69 VBottom 2
WINDOW 3 40 27 VTop 2
SYMATTR InstName R2
SYMATTR Value 2.2k
SYMBOL res 48 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 2.2k
SYMBOL res -128 128 M0
SYMATTR InstName R4
SYMATTR Value 4.7k
SYMBOL res 240 -80 M0
SYMATTR InstName R5
SYMATTR Value 4.7k
SYMBOL res 240 128 M0
SYMATTR InstName R6
SYMATTR Value 4.7k
SYMBOL voltage -608 48 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1 0
SYMATTR InstName V2
SYMATTR Value SINE(0 100m 125k)
SYMBOL res -432 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 50
SYMBOL Opamps\\LT1028 0 16 R0
SYMATTR InstName U3
SYMBOL Opamps\\LT1028 352 0 R0
SYMATTR InstName U4
SYMBOL res -128 -80 M0
SYMATTR InstName R8
SYMATTR Value 4.7k
SYMBOL res 560 128 R0
SYMATTR InstName R9
SYMATTR Value 10k
TEXT -608 -112 Left 2 !.tran 0 1m 0 100n
TEXT -608 -80 Left 2 !;ac lin 500 1k 1000k